As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(AUS) SMOKE AND FUMES IN IN COCKPIT. INVESTIGATION FOUND CAPTAIN`S INTERPHONE SYSTEM AUDIO SELECTOR PANEL FAULTY WITH THE MIC SELECTOR SWITCH STUCK AND THE LED NOT WORKING. SUSPECT CAUSED BY FLUID SPILLAGE CAUSING CORROSION. (CASA NR 510001793)